<template>
	<div>
		<router-link tag="div" to="/" class="header-abs" v-show="showAbs"> 
			<div class="iconfont header-abs-back">&#xe624;</div>
		</router-link>
		<div class="header-fixed" v-show="!showAbs" :style="opacityStyle">
			<router-link  to="/" >
				<div class="iconfont header-fiexd-back">&#xe624;</div>
			</router-link>
			景点详情
		</div>
	</div>
</template>

<script>
	export default{
		name:"DetailHeader",
		data(){
			return{
				showAbs:true,
				opacityStyle:{
					opacity:0
				}
			}
		},
		methods:{
			handleScroll(){
				const top=document.documentElement.scrollTop
				if(top>60){
					let opacityNow=top/140
					opacityNow=opacityNow>1?1:opacityNow
					this.opacityStyle={opacity:opacityNow}
					this.showAbs=false
				}else{
					this.showAbs=true
				}
				
			}
		},
		activated(){
			window.addEventListener("scroll",this.handleScroll)
		},
		deactivated(){
			window.removeEventListener("scroll",this.handleScroll)
		}
	}
</script>

<style lang="stylus" scoped>
	@import '~@styles/varibles.styl'
	.header-abs
		position :absolute
		left :.2rem
		top :.2rem
		width :.8rem
		height :.8rem
		line-height :.8rem
		border-radius :.4rem
		text-align :center
		background :rgba(0,0,0,.8)
		.header-abs-back
			color :#fff
			font-size :.4rem
	.header-fixed
		z-index :2
		position:fixed
		top :0
		left :0
		right :0
		height :$headerHeight
		line-height :$headerHeight
		text-align :center
		color :#fff
		background :$bgColor
		font-size :.32rem
		.header-fiexd-back
			position :absolute
			top :0
			left :0
			width :.64rem
			text-align :center
			font-size :.4rem
			color:#fff

</style>
